1 /* Copyright (C) 2003-2013 Free Software Foundation, Inc.
2 This file is part of the GNU C Library.
4 The GNU C Library is free software; you can redistribute it and/or
5 modify it under the terms of the GNU Lesser General Public
6 License as published by the Free Software Foundation; either
7 version 2.1 of the License, or (at your option) any later version.
9 The GNU C Library is distributed in the hope that it will be useful,
10 but WITHOUT ANY WARRANTY; without even the implied warranty of
11 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
12 Lesser General Public License for more details.
14 You should have received a copy of the GNU Lesser General Public
15 License along with the GNU C Library. If not, see
16 <http://www.gnu.org/licenses/>. */
18 #ifndef _BITS_ATOMIC_H
19 #define _BITS_ATOMIC_H 1
23 /* Coldfire has no atomic compare-and-exchange operation, and the
24 kernel provides no userspace atomicity operations. Here we just
25 use generic non-atomic implementations instead. */
27 typedef int8_t atomic8_t;
28 typedef uint8_t uatomic8_t;
29 typedef int_fast8_t atomic_fast8_t;
30 typedef uint_fast8_t uatomic_fast8_t;
32 typedef int16_t atomic16_t;
33 typedef uint16_t uatomic16_t;
34 typedef int_fast16_t atomic_fast16_t;
35 typedef uint_fast16_t uatomic_fast16_t;
37 typedef int32_t atomic32_t;
38 typedef uint32_t uatomic32_t;
39 typedef int_fast32_t atomic_fast32_t;
40 typedef uint_fast32_t uatomic_fast32_t;
42 typedef int64_t atomic64_t;
43 typedef uint64_t uatomic64_t;
44 typedef int_fast64_t atomic_fast64_t;
45 typedef uint_fast64_t uatomic_fast64_t;
47 typedef intptr_t atomicptr_t;
48 typedef uintptr_t uatomicptr_t;
49 typedef intmax_t atomic_max_t;
50 typedef uintmax_t uatomic_max_t;
52 /* The only basic operation needed is compare and exchange. */
53 #define atomic_compare_and_exchange_val_acq(mem, newval, oldval) \
54 ({ __typeof (mem) __gmemp = (mem); \
55 __typeof (*mem) __gret = *__gmemp; \
56 __typeof (*mem) __gnewval = (newval); \
58 if (__gret == (oldval)) \
59 *__gmemp = __gnewval; \
62 #define atomic_compare_and_exchange_bool_acq(mem, newval, oldval) \
63 ({ __typeof (mem) __gmemp = (mem); \
64 __typeof (*mem) __gnewval = (newval); \
66 *__gmemp == (oldval) ? (*__gmemp = __gnewval, 0) : 1; })